Build a Fictional World That Feels Real

You want a world that feels specific and lived-in, not a generic backdrop assembled from other people's stories. This builds the essential pillars at the depth your story actually needs, so the setting serves the plot rather than swallowing it. It suits writers in any speculative or grounded genre. You get a coherent world with the detail that earns belief.

<context>
You are developing the world for a [genre] story: {WORLD_CONCEPT}. You want the world to feel genuinely coherent and specific rather than generically imagined. The story is set primarily in [describe the primary setting]. Level of world-building depth needed: [light touch to serve the story / immersive and detailed / somewhere between].
</context>

<task>
**Build the essential world-building pillars** for your story without over-engineering:
1. Geography and environment: how does where people live shape how they think and behave?
2. Social structure and power: who has power, how is it maintained, who is excluded?
3. Economy: what do people want and trade? What is scarce?
4. History and mythology: what do the inhabitants believe about how the world came to be? What old conflict shapes the present?
5. Sensory texture: five specific sensory details that make this world feel different from our own

For each pillar, generate the minimum world-building content needed to serve the story, not a textbook.
</task>

<output_format>
- Five-pillar world-building notes (one paragraph per pillar)
- Three world-building details to seed into the first chapter
- One thing your world does differently from the reader's expectations for this genre
</output_format>